I've noticed that my boyfriend seems to be the popular target for my snakes: I've only gotten tagged twice when I had my BP (once was when I was feeding her and she missed, and the other time she didn't even get her teeth in me, she just bounced her face off me) and NEVER by my boa, but my bf has bled plenty of times from both of them. All he has to do is put his hand in the tank! But then again, everyone complains about how cold I feel (skin temperature-wise, lol), and my bf is like a freakin' mini-heater. We're pretty sure that they don't recognize me as anything because I'm too cool to trigger a response from them, but he gives off "I'm as warm as your dinner!!" temperatures.

That might be the same problem you're having. Your bf is just too hot for your snake.